1
Know what needs replacing. The two components that are most likely to require replacement on a led grow light are the power converters and the led diodes themselves , a fault developing with the led diodes themselves would be unusual as quality led diodes from market leading manufacturers Cree, Osram, Bridgelux etc., very rarely display faults. More often than not, it is a problem with the power converters that cause the faults in led grow lights.
2
Lay the led grow light face down (fans facing you) on a soft towel , polystyrene block etc to avoid damage to face of led grow light.
3
Loosen the case screws
Loosen the case screws
Loosen the case screws with a screwdriver and put the screws somewhere safe